My situation is sort of complex, but please bare with me. My father started a business with another brother in our community many years ago. Shortly there after it became apparent that this brother was not completely honest in his business dealings, and because of this my father eventually came to own this business fully. Since then this man has on several occasions insulted my father publicly especially at mosque gatherings, Eid Prayers ect. My father has always taken the highroad when it comes to this brother, he has on several occasions attempted to reconcile with him and make things better to no avail. I've always stayed out of this because frankly it is not my place.
Shortly after their business dealings went sour; my father began receiving typewritten notes all written in the same style: threatening him, saying low and nasty things that were not at all true about him. My father had a sneaking suspicion that his ex-business partner was the man behind these letters. However it was hard to pin the blame entirely on him since the letters were postmarked from different parts of our state and neighboring states. However, his feelings were confirmed when a mutual friend casually mentioned that the man had went to visit someone in a certain city, from which, on the same day, another one of these mystery letters was posted. Not interested in pursuing the matter my father ignored the letters, and eventually the letters stopped, and nobody except for my mom and my dad knew about them.
Aside from the bad mouthing at masjid functions, we really never heard from this man since then. However, I recently got married, and my husband and I had asked our guests to donate to an Islamic Charity in place of gifts. My father invited everyone he knew to my wedding except for this one man and his family. Shortly before my wedding my mother found a letter in the mailbox very similar to the one my father received years ago. When we (my mom and I) opened the letter it seemed like a casual note, but as we read on we realized it was a nasty letter, that suggested that my father use me as a prostitute to make more money for the charity we had named. This upset my mom greatly, but since it was so close to the wedding, I asked her to just throw away the letter without showing it to my dad since it was bound to make him extremely angry. However, we got another letter today, and it suggested the same thing. I will ignore this one as well, and I know that this man will have to answer to Allah about his actions. Additionally, something happy is about to happen in this man's family. It is something that his entire family has been making dua’ about for a very long time.
Here's my dilemma, my father in law who is visiting for the better part of the year usually checks our mail. My father in law is really close to my family and knows the whole story behind my father’s business, additionally my father in law is not as patient or forgiving as my dad. I am afraid that one of these days, my father in law will open up one of these letters and sabotage the happy occasion in this man’s family. Is this fear unreasonable? Should I warn this man about the consequences of his actions? Part of me says that I shouldn’t care, but masha Allah, the rest of this man’s family is full of really terrific people that I love dearly and really want the best for.